| The direction taken by the block would have been controlled by actionning the parachute or the retrorocket, or with the elevons of the wings. |
| The system of rescue could be a parachute, a parachute combined with retrorocket, or wings and an turbojets. |
| The ULA Atlas V retrorocket is built at Orbital ATK's Elkton, Maryland, facility. |
| The retrorocket failed to separate and burned away during the descent whilst above Egypt, about 10 minutes later than intended. |
| In the first flights the blocks were not equipped with parachutes nor of retrorocket, because the monitoring equipment was installed there. |
| Will the retrorocket landing system designed for the Dragon capsule land smoothly on Mars? |
